start code execution problem with MX_LWIP_Init

[S_bgh99]

Hi

I add ethernet communication to my program with STM32CubeMx and I just compiled and run it. I have a problem:

if I disconnect Jlink the board I have a ping error. but I run the code with 3 times click on run in MDK-ARM the board will ping.

I also try my app without

MX_LWIP_Init();

if I comment this line all thing is good.

you can find 3-time click video here

[alister]

Errors in and around MX_LWIP_Init is a regular topic.

https://community.st.com/s/question/0D50X0000BOtfhnSQB/how-to-make-ethernet-and-lwip-working-on-stm32

[SKast.1]

Hi, S_bgh99,

Did you find the solution for the problem you mentioned?

If Yes, can you suggest me what is the way to figure out this issue.

[NAham.1]

Hello S_bgh99,

I am facing the above said issue

Could you please guide me to fix this issue

Thanks in Advance!

[NAham.1]

Hi,

I got the solution for this issue

Thanks!

[rgruberski]

Would you tell me a bit more about how have solved this issue? I have very similar problems and looking for a solution. Thank you in advance!

[jezo]

I had the same problem. This is caused by the use of printf in the LWIP library. The Retarget.c file must be added to the project, or just add this smal code to main.c

struct __FILE { int handle; };
FILE __stdout;

int fputc(int c, FILE *f) {
  return (0);
}

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